There are still some hoops to jump through to make MP campaigns work properly. Save games must be loaded in a specific way to not break variables/settings across multiple maps.

Tips for safely reloading MP campaign games:

-Make sure the original host reloads the game.
-Never use a start of scenario save. Always use a manual save, created by the original host.
-Never use an end of scenario save (while the End Scenario button is visible)
-Never use the Back to Turn function. Ever. Not even when playing in SP.
-When loading a local game from the main menu, use multiplayer -> local game -> load game

CURRENT KNOWN BUG:
Do not delete any units in your recall list. Ever. Even if the unit is useless, deleting a unit in your recall list will cause OOS for other players.

Scenario with Robots SP scenario (1.11/1.12), allows you to build your units with components, PYR No preperation turn 1.12 mp-mod that allows you to select your units immideately after the game begins.